There is demand to use cryptocurrency as payment option. Many people already have it and also entrepreneurs and companies have it and day by day crypto is more common and mainstream thing.

Example French Connection Finance (FCF) has developed crypto payment gateway and it is used by ecommerce and brick and mortar stores (you can use most common cryptos as a payment). It is actually very easy to use for both merchants and customers. I have tried as customer. Fees are also very competitive (0.5-1.5 %) versus credit cards or PayPal. Credit cards have pressure to raise their fees [Suspicious link removed]j.com/articles/visa-mastercard-prepare-to-raise-credit-card-fees-11646743166) so crypto is an easy solution to cheaper fees at the moment.
So already in some stores you have and option to pay with cryptocurrency. And in future it will just spread when we talk about it and customers demand crypto as a payment option from companies.